Environmental Engineering Reference
In-Depth Information
Table 11.4
(continued)
Name
Key character for identii cation
Habitat
Distribution
Theodoxus
(
Clithon
)
bicolor
(Recluz)
Shell is generally olive green or olive brown
with small dark squares and the spire is more
produced
Mountain stream, attached with tree roots, coral
reef boulders
Andaman and Nicobar Islands
Theodoxus
(
Clithon
)
corona
(Linnaeus)
Shell small with shouldering body whorl, spine
present or absent
Found in streams with moderate salinity
Nicobar Islands (Katchal)
Theodoxus
(
Clithon
)
reticularis
(Sowerby)
Shell yellowish olive or green with oblique
angulated red or black thin lines, often forming
a coarse reticulation or network, a well-
developed tooth on the inner columellar margin
Found in estuarine water rarely extending to the
freshwater
West Bengal, Tamil Nadu:
Porto Novo
Septaria lineata
(Lamarck, 1816)
Cap-like shell, with the last whorl greatly
expanded. The operculum reduced to a small
quadrangular plate
On rocks in perennial and rapidly fl owing
streams near the zone of tidal infl uence; also
found in saline water
Andaman Islands, Tamil Nadu
(Coleron River) and West
Bengal: 24 Parganas (South)
Septaria porcellana
(Linnaeus)
Shell thick, apex is generally projecting beyond
the posterior margin
Attached with rocks in freshwater streams
Andaman and Nicobar Islands
Taia crassicallosa
(Annandale and Rao)
Shell globose, spire short and broad, ridges well
developed; squamous tubercles, columellar
callus greatly thicken
Large lakes, wetlands of northeastern region
Manipur: Imphal, Jiribam,
Bishenpur, Tripura
Bellamya bengalensis
(Lamarck)
Shell thin, more or less smooth, with three or
more colour bands; embryonic shell delicate
and thin, with three primary rows of chaetae,
low ridges, the lower most well developed,
sometimes developing into a keel, secondary
ridges bearing chaetae may develop between
the primary ones
Ponds, ditches, small water bodies, rivers,
streams. They are mainly benthic
Common throughout India
Form
typica
Form
annandalei
(Kobelt)
Form
balteata
(Benson)
Form
colairensis
(Annandale)
Form
doliaris
(Gould)
Form
eburnean
(Annandale)
Form
gigantea
(Reeve) phase
halophila
(Kobelt)
Form
mandiensis
(Kobelt)
Bellamya crassispiralis
(Annandale)
Shell bluntly acuminate, whorls tumid, body
whorl transverse and oblique, anterior margin
strongly sinuate with six delicate ridges
Chakpi stream
Manipur Valley (known by
type)
Bellamya crassa
(Benson)
Shell olive brown, globose without colour
bands, spire small and blunt, shell surface
sculptures with fi ne wavy spiral lines
Ponds, burrowing in mud or sand in shallow
waters, often in groups
Andhra Pradesh, Assam,
Karnataka, Meghalaya,
Odisha, Gujarat, West Bengal
Search WWH ::
Custom Search